Turnover of dissolved organic carbon fuels nocturnal CO2 emissions from a headwater catchment reservoir, Southeastern China: Effects of ecosystem metabolism on source partitioning of CO2 emissions
文献类型：期刊论文
| 作者 | Zhang, Peipei; Jiao, Ruyuan ; Gong, Chen; Wang, Fang; Yan, Weijin; Li, Qingqian; Wang, Dongsheng
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| 刊名 | JOURNAL OF ENVIRONMENTAL SCIENCES
 |
| 出版日期 | 2022 |
| 卷号 | 121页码:1-14 |
| 关键词 | Ecosystem metabolism DOC turnover CO2 emission rate Source partitioning of CO2 emissions delta C-13(DIC) |
| ISSN号 | 1001-0742 |
| 英文摘要 | Dam reservoirs in headwater catchments, as critical zones for their proximity to terrestrial sources, play important roles in dissolved organic carbon (DOC) cycling. However, the effects of ecosystem metabolism (EM) on DOC cycling are not well known. Here, in-situ diurnal and monthly observations were conducted to measure EM (including gross primary production (GPP), ecosystem respiration (ER) and heterotrophic respiration (HR)), DOC turnover and CO2 emissions in a headwater catchment reservoir in Southeastern China in 2020. Our study showed the nocturnal CO2 emission rate was about twice as high as in daytime, and was strongly driven by EM. The values for DOC turnover velocity ranged from 0.10 to 1.59 m/day, and the average DOC turnover rate was 0.13 day(-1), with the average removal efficiency of 12%. The contribution of respired DOC to daily CO2 emissions ranged from 17 to 61%. The accumulated efficiencies were estimated to be 13% for the selected 15 reservoirs throughout the Changjiang River network, corresponding to about 0.34 Tg C/year of the respired DOC. The modified CO2 flux was 0.75 Tg C/year, and respired DOC accounted for about 45% of total emitted CO2 from the 15 larger reservoirs. Our research emphasizes the necessity of incorporating the effects of EM into studies of reservoir DOC removal and CO2 emissions. (C) 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/48543]  |
| 专题 | 生态环境研究中心_水污染控制实验室 |
| 作者单位 | 1.Institute of Geographic Sciences & Natural Resources Research, CAS 2.Research Center for Eco-Environmental Sciences (RCEES) 3.University of Chinese Academy of Sciences, CAS 4.Chinese Academy of Sciences |
| 推荐引用方式 GB/T 7714 | Zhang, Peipei,Jiao, Ruyuan,Gong, Chen,et al. Turnover of dissolved organic carbon fuels nocturnal CO2 emissions from a headwater catchment reservoir, Southeastern China: Effects of ecosystem metabolism on source partitioning of CO2 emissions[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2022,121:1-14. |
| APA | Zhang, Peipei.,Jiao, Ruyuan.,Gong, Chen.,Wang, Fang.,Yan, Weijin.,...&Wang, Dongsheng.(2022).Turnover of dissolved organic carbon fuels nocturnal CO2 emissions from a headwater catchment reservoir, Southeastern China: Effects of ecosystem metabolism on source partitioning of CO2 emissions.JOURNAL OF ENVIRONMENTAL SCIENCES,121,1-14. |
| MLA | Zhang, Peipei,et al."Turnover of dissolved organic carbon fuels nocturnal CO2 emissions from a headwater catchment reservoir, Southeastern China: Effects of ecosystem metabolism on source partitioning of CO2 emissions".JOURNAL OF ENVIRONMENTAL SCIENCES 121(2022):1-14. |
入库方式： OAI收割
来源：生态环境研究中心
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